https://phys.org/news/2018-12-nasa-tiny-remnants-tropical-cyclone.html

Infrared data provides temperature information. That small patch of strongest thunderstorms had cloud top temperatures as cold as minus 63 degrees Fahrenheit (minus 53 Celsius). NASA research has shown that cloud tops with temperatures that cold were high in the troposphere and have the ability to generate heavy rain.

Owen's remnants are expected to dissipate within a day or two.

                                                            
                                    
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